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  1. Z

    Programs Which choice is best for a Physics major?

    Thanks for the responses, everyone. I will probably be going to UCR and then apply to a higher-ranked school (like UCSB) for the graduate program, saving me the debt but also giving me a top degree.
  2. Z

    Programs Which choice is best for a Physics major?

    I have recently been accepted as a major in Physics to UCR, UCI, and UCSB. I know that UCSB is the highest ranked of all the UC's in Physics particularly (except Berkeley, which I did not get in to), but my main dilemma here is that there are other factors in play. With where I live, I could...
  3. Z

    B Why isn't water on the ISS dangerous?

    Sorry, I wasn't sure if this counted as beginner since it's not about an actual astrophysical concept. So if only a little bit flies off, there isn't a risk of it short circuiting anything? Could the highly pure nature of the water also help this? For example, the numerous (but all tiny)...
  4. Z

    B Why isn't water on the ISS dangerous?

    Obviously, just about anywhere you go in the ISS, the walls are lined with electronics. Potentially a silly question, but why don't the astronauts need to be more careful when they handle water, considering that it could short circuit the electrical systems? Example:
  5. Z

    Stargazing Movement of Stars seen from the North Pole

    Thanks, I can see it now after a bit of visualization.
  6. Z

    Stargazing Movement of Stars seen from the North Pole

    Ah, I see what you mean there. In a purely theoretical sense, though, is it not true that the point exactly along the axis of rotation would not be rotating, even though every single other point would be rotating with the same angular speed? For example, with a merry go round, although no matter...
  7. Z

    Stargazing Movement of Stars seen from the North Pole

    Is that caused by being not exactly at the south pole, but near it, thus still rotating (which is why the sun appears to move in a circle)? I don't theoretically see how a point along the axis of rotation could be moving at all. The speed of rotation on Earth varies by the cosine of latitude, so...
  8. Z

    Stargazing Movement of Stars seen from the North Pole

    As in, at the point where the Earth's axis of rotation intersects with the surface, there is still rotation?
  9. Z

    Stargazing Movement of Stars seen from the North Pole

    From the perspective of someone at or near the exact north pole (where, for all practical purposes, they are not rotating), ignoring the gradual change of the stars as the Earth orbits the sun, would the stars appear to move at all in the night sky? Or would they be stationary because the...
  10. Z

    Gravitational Force/Earth Rotation Question

    Well yes, there are always forces from other sources in play, but when you add a force exactly opposite to the force of Earth's gravity, then the only forces acting on it will be the forces making it orbit the sun, the galactic center, etc., without the force of gravity from the Earth that keeps...
  11. Z

    Gravitational Force/Earth Rotation Question

    Ah, so the coriolis effect is caused, in some ways/situations, by having the centripetal force of gravity overcome? With my example of applying the upward force, I mean that the apparent acceleration of the object is slightly less than its true acceleration (some if its acceleration is what...
  12. Z

    Gravitational Force/Earth Rotation Question

    I suppose my question is more about this: would a rocket launched vertically upward find itself to no longer be above the same point that it launched from as it kept moving upward? Also, making something "float" requires that you cancel out its weight, but not its centripetal force of gravity...
  13. Z

    Gravitational Force/Earth Rotation Question

    I'm wrong, centrifugal force does not exist, however the centripetal force needed to keep us rotating with Earth does exist and can be overcome. That's my question, wouldn't anything that overcomes the force of gravity (both weight and the centripetal force component) appear to slowly...
  14. Z

    Gravitational Force/Earth Rotation Question

    Ah! I think I see now. The only force that gives us weight is the component of the force of gravity (almost the entirety of this force) that is left over after the force of gravity overcomes the centrifugal "force," and no upward force on any body on the Earth can make the force of gravity stop...
  15. Z

    Gravitational Force/Earth Rotation Question

    Does the force have to be exactly equal? Or would any force that is greater than gravity also have the same effect? I would think that any force overcoming gravity would make an object stop rotating with the planet. Conservation of momentum is only true without an outside force on the system...
  16. Z

    Gravitational Force/Earth Rotation Question

    The force of gravity is what makes things on the Earth rotate with it, instead of flying off. Doesn't this mean, however, that if you were to apply an upward force on something exactly equal in magnitude to the gravitational force on the object (so the net force on it is 0), it would cease to...
  17. Z

    B Questions about Lunar Phases

    Thanks! So has it actually been documented how slightly different parts of the moon are visible at different places on Earth?
  18. Z

    B Questions about Lunar Phases

    My first question is: Shouldn't the lunar phases be thrown off by Earth's orbit of the sun? As in, after 6 months of orbit, since we are on opposite sides of the sun, the phases would be reversed so that the moon being in the same position relative to the Earth as it was before the 6 months...
  19. Z

    Circuitry Confusion

    I have a number of questions on how circuits really function - my class just found itself looking at circuit diagrams and voltages without any explanation of the basics of how circuits actually work. 1) How does the concept of electric potential difference between two points, like with a point...
  20. Z

    Question about Orbits of Moon/Earth around Sun

    How, exactly, is the moon able to orbit the Earth while at the same time moving with Earth's orbit of the Sun? I understand that the Earth/Moon both have the same accelerations caused by the Sun's gravity, but accelerations are not additive - only forces. At any time, the moon will be pulled by...
  21. Z

    What's going on in this snapshot from the ISS?

    I haven't noticed a black spot getting bigger, but it could just be camera imperfections. NASA explained in the article about it that the black/green line at the right is the result of how they merge differently colored images to create the normally colored one. It is indeed at L1.
  22. Z

    What's going on in this snapshot from the ISS?

    Ah, alright, after thinking it through it makes sense. The distance from the Earth to the moon is about 62.5 times the radius of the Earth; taking the angles in to consideration, it makes sense that from the DSCOVR satellite, the portion of the moon's orbit during which the moon appears to be in...
  23. Z

    What's going on in this snapshot from the ISS?

    The photos were taken between 3:50 and 8:45, a length of 4 hours and 55 minutes, so it would seem to make sense it didn't rotate much. In that time period, the moon would undergo about 0.0076 rotations. But judging by the pictures alone, shouldn't the moon be facing towards the center of the...
  24. Z

    What's going on in this snapshot from the ISS?

    Alright, thanks. Another thing I've found that confuses me is this view from NASA's DSCOVR satellite: It's obvious why the moon does not cast a shadow on the Earth, and NASA explained that the green lines to the side of the moon are caused by how they process the colors of the images, but I'm...
  25. Z

    What's going on in this snapshot from the ISS?

    Wait, so this is pre-recored?
  26. Z

    What's going on in this snapshot from the ISS?

    Yeah, it was in the unedited live stream. I don't really have any way to prove this, but I certainly didn't photoshop it or anything just to post it here in an attempt to confuse people.
  27. Z

    What's going on in this snapshot from the ISS?

    I did, indeed, take the screen shot myself. I saw the strange gray section on the Earth as it rotated, as if it was actually a part of the planet. Perhaps it was something wrong with my receiving of the image?
  28. Z

    What's going on in this snapshot from the ISS?

    Haha, I'm not one of those "flat Earth" morons. Thanks for looking in to it.
  29. Z

    What's going on in this snapshot from the ISS?

    Alright, thanks. Don't know much at all about optics, haha.
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